1.The time rate of change of position of a body in a particular direction
2. And by an arrow.
20.5
You divide the distance traveled by the time.
It is 20 km per hour, due North.
Speed = Distance divided by Time. So, speed = 75 miles divided by 2.5 hours = 75 / 2.5 = 30 miles per hour. Velocity is speed and direction, so the velocity is 30 mph Northbound.
Velocity = 790.514 m/s North (rounded)The idea is to divide the distance by the time.
We're not completely sure what you mean by "per hour per second". Going just by what we see in the question, it's an acceleration, not a velocity. "Six miles per hour north" would be a velocity.
50km/hour North.
The average velocity during that period of time is 100 kilometers per 2 hours north. It may also be stated as 50 kilometers per hour north.
With the information given, it's not possible to calculate what it is now. But during that 90 minutes, its average velocity was 50 kph north.
You divide the distance traveled by the time.
4 hours
It is 20 km per hour, due North.
Consider the two statements: (1) The car left town and traveled 50 km. (2) The car left town and traveled 50 km NORTH. In the first statement we are merely talking about the distance traveled We do not know which way the car went. This is speed. SPEED is only a magnitude. In the second, we are giving more info by adding the DIRECTION in which the car traveled. This is VELOCITY. VELOCITY gives speed together with DIRECTION. You can see that VELOCITY is more informative than SPEED. In everyday life, people in the streets use the two terms interchangeably, but in science and engineering the distinction is important.
In common language, the terms are used interchangeably. But in physics, speed is a scalar; velocity is a vector. That is, a speed is just a number (and a unit) - for example, 50 kilometers/hour. But when it is important to distinguish a direction, you talk about a velocity. For example, "50 kilometer/hour to the north". Velocity is a speed AND a direction. "50 km/hour north" and "50 km/hour east" are the same speed but different velocity.
Velocity of a moving body is its rate of DISPLACEMENT with respect to time. But speed is distance traveled per unit time. The difference between speed and velocity is that velocity has a direction. 30mph is a speed. 30mph due north is a velocity. Well not really because 'north' is arbitrary but you get the idea. Displacement is both a distance and direction. 30 miles is a distance. 30 miles to the north is a displacement. A two part quantity like velocity or displacement is called a 'vector quantity'. A one part quantity (speed, distance etc) is called a 'scalar quantity'.
Average velocity is simply the difference in position, divided by the time. Since you use the word "velocity" rather than "speed", a direction must be indicated. Exapmle: If you drive 100 km. due North, during 2 hours, your average velocity is 50km. per hour due North.
The difference between speed and velocity is that velocity is speed with a direction vector associated with it. It's that direction vector that makes them different.Speed is displacement (distance traveled) per unit time. Velocity is displacement (distance traveled) per unit time in a given direction. The "directionality" associated with velocity makes it a vector quantity, while speed is a scalar quantity.The main difference between them in everyday life is that "speed" is usually usedproperly, but "velocity" is usually used Improperly.-- "30 miles per hour" is a speed-- "30 miles per hour north" is a velocity-- "30 miles per hour north" and "30 miles per hour west" are the same speed but different velocities.
Speed = Distance divided by Time. So, speed = 75 miles divided by 2.5 hours = 75 / 2.5 = 30 miles per hour. Velocity is speed and direction, so the velocity is 30 mph Northbound.